Issue #3264862 by mglaman, ankithashetty, longwave: ContextAwarePluginBase...

Issue #3264862 by mglaman, ankithashetty, longwave: ContextAwarePluginBase class not annotated as deprecated

(cherry picked from commit 4dcb45e2)

core/lib/Drupal/Core/Plugin/ContextAwarePluginBase.php

@@ -13,6 +13,11 @@
 
 /**
  * Base class for plugins that are context aware.
+ *
+ * @deprecated in drupal:9.1.0 and is removed from drupal:10.0.0. Use
+ *   \Drupal\Core\Plugin\ContextAwarePluginTrait instead.
+ *
+ * @see https://www.drupal.org/node/3120980
  */
 abstract class ContextAwarePluginBase extends ComponentContextAwarePluginBase implements ContextAwarePluginInterface, CacheableDependencyInterface {